java - Google App Engine Datastore too slow persistence -

i'm developing gae/j app using jdo manage datastore. offers number of endpoints interact data , on. i'm developing javascript client endpoints.

situation:

first have endpoint method token getsessiontoken(user usr), generates session token, assigns user , stores both user , session token in datastore.

then have endpoint method info getinfo(token token) receives session token, checks if session token corresponds user , if so, returns info.

problem

from javascript client, call first method , fine. call second method retreved session token, , receive error saying session token doesn't correspond user...

i've checked , realised error happens because new session token has not been persisted yet!

question

my current solution make javascript client call second method once, , if receives error, wait while , call again... there better solution?

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edit:

this code invloved in first method call idea why takes long...

endpoint:

@apimethod(     name = "getsessiontoken",     path = "get_session_token",     httpmethod = httpmethod.get ) public sessiontoken getsessiontoken (@named("email") string email, @named("password") string password)          throws internalservererrorexception {            sessiontoken sessiontoken = new userscontroller().getsessiontoken(email, password);     return sessiontoken; } 

control:

public sessiontoken getsessiontoken(string email, string password) throws internalservererrorexception {             sessiontoken sessiontoken = null;      persistencemanager pm = pmf.get().getpersistencemanager();           transaction txn = datastoreservicefactory.getdatastoreservice().begintransaction();     try {         dao dao = new dao(pm);          user user = dao.getuserbylogin(email, password);          dao.deletesessiontoken(user.getsessiontoken());         sessiontoken = sessiontokenmanager.generatetoken(user.getemail(), user.getpassword());         user.setsessiontoken(sessiontoken);          user = dao.insertuser(user);              txn.commit();         } catch (exception e) {         throw new internalservererrorexception();     } {         if (txn.isactive()) {             txn.rollback();         }         pm.close();     }            return sessiontoken; } 

dao:

public user getuserbylogin(string email, string password) throws internalservererrorexception {     user user = null;     query query = null;     try {         query = this.pm.newquery(user.class);         query.setfilter("email == emailparam && password == passwordparam");         query.declareparameters("string emailparam, string passwordparam");              list<user> results = (list<user>) query.execute(email, password);         user = results.get(0);     } catch (exception e) {         e.printstacktrace();         throw new internalservererrorexception("error in dao.getuserbylogin()");     } {         query.closeall();     }     return user; }  /////  public void deletesessiontoken(sessiontoken sessiontoken) throws internalservererrorexception {     try {         this.pm.deletepersistent(sessiontoken);     } catch (exception e) {         e.printstacktrace();         throw new internalservererrorexception("error in dao.deletesessiontoken()");     } }  /////  public user insertuser(user user) throws internalservererrorexception {          try {         this.pm.makepersistent(user);     } catch (exception e) {         e.printstacktrace();         throw new internalservererrorexception("error in dao.insertuser()", e);     }                     return user; } 

model:

@persistencecapable public class user {      @primarykey     @persistent(valuestrategy = idgeneratorstrategy.identity)     private key key;         @persistent     private string name;     @persistent     private string email;     @persistent     private string password;         @persistent     private folder rootfolder;       @persistent     private sessiontoken sessiontoken;       @persistent(defaultfetchgroup = "true")     private accountcontainer accountcontainer;     //getters & setters }  /////  @persistencecapable public class sessiontoken {              @primarykey     @persistent(valuestrategy = idgeneratorstrategy.identity)     private key key;     @persistent     private string token;     @persistent     private long created;     @persistent     private string sha1;     //getters & setters } 

maybe 1 of following possible , suits needs

• can combine 2 calls "getsessiontokenandinfo" call? return token , info together. depending how code works maybe token , user objects available , dont need loaded then?

• use form of caching first endpoint leaves in memcache need try retreive datastore in second call removed (at least in cases memcache should reliable enough such scenario).